Question

Assertion :Promotor is said to be located towards $5$'-end of the structural gene. Reason: Promotor is a DNA sequence that provide binding site for DNA polymerase.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Answer 1

The correct option is C Assertion is correct but Reason is incorrect

Promoter sequences are the region of DNA sequences in the gene where the RNA polymerase will bind and initiate the process of transcription. They are located upstream at the 5' end of the transcription initiation site in the structural gene. Promoter sequences define the direction of transcription and indicate the DNA strand that will be transcribed. The strand which is from 5'-3' is the non-template strand and the strand which runs from 3'-5' is known as the template strand. DNA sequences called response elements are located within promoter regions, and they provide a stable binding site for RNA polymerase and transcription factors. Transcription factors are proteins which recruit RNA polymerase and control and regulate the transcription of DNA into mRNA.
So, the correct option is option C.